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.Management Sciences
Category: Refrigeration and Air Conditioning
The value of COP in vapour compression cycle is usually__________________?
A. always less than unity
B. always more than unity
C. equal to unity
D. any one of the above
E. none of the above
Under-cooling in a refrigeration cycle_________________?
A. increases COP
B. decreases COF
C. COP remains unaltered
D. other factors decide COP
E. unperdictable
Cooling water is required for following equipment in ammonia absorption plant__________________?
A. condenser
B. evaporator
C. absorber
D. condenser and absorber
E. condenser, absorber and separator (rectifier)
Critical temperature is’ the temperature above which _____________________?
A. a gas will never liquefy
B. a gas will immediately liquefy
C. water will evaporate
D. water will never evaporate
E. none of the above
On the pressure-enthalpy diagram, condensation and desuperheating is represented by a horizontal line because the process ________________?
A. involves no change in volume
B. takes place at constant temperature
C. takes place at constant entropy
D. takes place at constant enthalpy
E. takes place at constant pressure
Which of the following refrigerants has lowest freezing point_______________?
A. Freon-12
B. NH3
C. C02
D. Freon-22
E. S02
The vapor pressure of refrigerant should be_________________?
A. lower than atmospheric pressure
B. higher than atmospheric pressure
C. equal to atmospheric pressure
D. could be anything
E. none of the above
Refrigeration in aeroplanes usually employs the following refrigerant___________________?
A. Co2
B. Freon-11
C. Freon-22
D. Air
E. none of the above
In a vapor compression cycle, the refrigerant immediately after expansion valve is___________________?
A. liquid
B. sub-cooled liquid
C. saturated liquid
D. wet vapour
E. dry vapour
The bank of tubes at the back of domestic refrigerator are _________________?
A. condenser tubes
B. evaporator tubes
C. refrigerant cooling tubes
D. capillary tubes
E. throttling device
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